Calibration of Pressure Measurement Channels in Wind Tunnels

The article deals with estimating errors in the measurement systems during experimental tests of unmanned aerial vehicles in the wind tunnel. The instrumentation and technique used for calibrating pressure parameters are described. Features of the measurement in the wind tunnel are characterized. The main sources of pressure measurement are listed. The features of measuring pressure in the wind tunnel are discussed. The structural diagram of the calibrating channel of pressure measurement. The transformation function of the measuring channel was proposed. The approach for estimating relative errors is represented. The estimation of high-velocity head measurement errors has been carried out. Relative and absolute errors of velocity head were estimated. Errors in measuring airflow speed have been estimated. It is shown that the velocity of the airflow is the result of an indirect nonlinear measurement. The obtained results can be useful for testing unmanned aerial vehicles of different types. They can also be applied to the measurement of the pressure in various experimental equipment.